1.long service life,high reliability,wide operation range
2.small dimension,large power,strong in inrush current limiting
3.fast response to surge current
4.large material constant,low resistance residue
5.can limit inrush current effectively
6.minimum power loss in stationary state(Normally just 1W or less than 50W power)
7.high thermal and electrical reliability
8.wide selection of electrical characteristics
9.Wide operating temperature -55~+200 ℃
NTC Thermistor Working principle:
When turn on an electrical equipment,a prodigious surge current arises in the moment can be restrained effectively by a power NTC thermistor connected in series with the power circuits,which including a capacity, heater, motor.This inrush current lasts short, but its peak current is prodigious. It can even exceed 100 times of operating current in conversion power, switch power and UPS power.So limiting the surge current measures must be took effectively.When current is applied on NTC thermistor directly, NTC resistance may decrease with the heating of NTC thermistor speedily. Power type NTC thermistor has a specified zero power resistance, when it is in series in the circuit, it can restrain the switch-on surge current effectively. After it completes surge current limiting function, due to the current operation continuously, the resistance can decrease to very small value, its power consumption can be neglected, does not influence the normal operation current. Therefore, applying power NTC thermistor in the power supply loop is a most effectively and most brief measure to restrain surge current,protecting electrical equipment from destruction.
Be noticed, the thermistor can not be used in parallel in the circuit since one unit will tend to conduct all the current available nearly.
MF72 series NTC Thermistor devices for limiting surge current are made of a specially formulated metal oxide ceramic material and in the form of radial resin coated that is capable of limiting high surge current. Applying power NTC thermistor in the power supply loop is the most simple, convenient and effective measure to restrain switch-on surge current and protect electronic equipment.